OLED Pixel Domain Inclination for Light Extraction
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Solution Overview
Problem
Organic light emitting display devices face low emission efficiency and reduced display characteristics, such as white angle dependency and side visibility, due to the optical path changes at the front of internal resonant structures.
Innovation Solution
The device incorporates a pixel structure with at least two domains that radiate light in different directions, with the organic layer's upper surfaces inclined at specific angles, allowing for improved light extraction and reduced optical path differences across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an internal resonant structure is used to improve light extraction efficiency, then light extraction efficiency is improved, but white angle dependency and side visibility are reduced
Solution Approach 1:
The pixel electrode is divided into multiple domains (first domain and second domain) with different organic layer configurations. Each domain has a distinct light extraction structure that radiates light in different directions, segmenting the light extraction function to improve both efficiency and viewing angle characteristics
Solution Approach 2:
Different regions of the pixel (domains) are given different local structures - the first domain has an organic layer configured for one light extraction direction while the second domain has an organic layer configured for another direction. This local differentiation allows each region to optimize for its specific function while collectively improving overall display performance
2Ease of manufacture
If the organic layer has a flat surface, then manufacturing is simple, but light extraction efficiency and viewing angle characteristics are poor
Solution Approach 1:
The organic layer is configured with curved or inclined surfaces instead of a flat surface. The first and second domains have organic layers that are inclined relative to the substrate surface, creating non-planar light extraction interfaces that improve light outcoupling efficiency and viewing angle characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances display quality by minimizing changes in image quality when the viewing angle increases, maintaining image integrity and improving side visibility.
Implementation Method 1
an organic light emitting diode including a first electrode on a substrate, an organic layer on the first electrode, and a second electrode on the organic layer
Implementation Method 2
The upper surfaces of the organic layer at the respective first and second domains may be opposite to each other and may be inclined downward... An inclination angle of the organic layer at the respective first and second domains may be in a range of about 0 to about 90 degrees
Data Source
AI summary
An organic light emitting display device includes a scan line, a data line, a power supply line, and a pixel. The scan line extends in one direction. The data line crosses the scan line. The power supply line crosses the scan line and the data line. The pixel is electrically coupled to the scan line, the data line, and the power supply line. The pixel includes an organic light emitting diode including a first electrode on a substrate, an organic layer on the first electrode, and a second electrode on the organic layer. The pixel further includes at least two domains configured to radiate light in directions different from each other.